Units for the rsvg.types.Length struct. These have the same meaning as [CSS length units](https://www.w3.org/TR/CSS21/syndata.html#length-units).
percentage values; where <literal>1.0</literal> means 100%.
pixels
em, or the current font size
x-height of the current font
inches
centimeters
millimeters
points, or 1/72 inch
picas, or 1/6 inch (12 points)
Units for the rsvg.types.Length struct. These have the same meaning as [CSS length units](https://www.w3.org/TR/CSS21/syndata.html#length-units).